 /*******************************************************************************
  * Copyright (c) 2000, 2005 IBM Corporation and others.
  * All rights reserved. This program and the accompanying materials
  * are made available under the terms of the Eclipse Public License v1.0
  * which accompanies this distribution, and is available at
  * http://www.eclipse.org/legal/epl-v10.html
  *
  * Contributors:
  * IBM Corporation - initial API and implementation
  *******************************************************************************/

 package org.eclipse.ui.texteditor;


 /**
  * Extension interface for actions. Actions implementing this interface not
  * only manage an enable/disable state but also manage a "hypothetical"
  * enable state, depending on whether the target they work on is writable
  * or read-only.
  *
  * @since 2.0
  */
 public interface IReadOnlyDependent {

     /**
      * Returns whether the actions would be enabled if its target
      * would be enabled given the writable state described by <code>isWritable</code>.
      * <code>isEnabled()</code> and <code>isEnabled(boolean)</code> holds the following
      * invariants:
      * isEnabled() == false, if isEnabled(true) == false || isEnabled(false) == false
      * isEnabled() == true, if isEnabled(true) == true || isEnabled(false) == true
      *
      * @param isWritable
      * @return the hypothetical enable state of the action
      */
     boolean isEnabled(boolean isWritable);
 }

